Alexander shiels



(No Model.) 2 Sheets-Sheet 1.

A. SHI ELS. VACUUM 0R SUCTION PUMP.

No. 592,888. 1 Patented Nov. 2,1897.

(No Model.) 2 Sheets-Sheet 2.

A. SHIEL S. VACUUM 0R SUCTION PUMP.

No. 592,888. Patented Nov. 2, 1897.

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UNITED STATES P TE T men VACUUM OR SUCTION PUMP.

SIECIFICATION forming part of Letters Patent No. 592,888, dated November 2, 1897.

Application filed February 3, 1896. Serial No. 577,861-

To all whom it may concern.-

Be it known that I, ALEXANDER SHIELs, M. 13., O. M., B. Sc.,.a' subject of the Queen of Great Britain, and a resident of the city of Glasgow, Scotland,have invented certain new and useful Improvements in and Connected with Vacuum or Suction Pumps, (patented in Great Britain, No. 3,979, dated February 25, 1895,) of which the following is a specification.

This invention relates to vacuum or suction pumps; and it has for its object to improve their construction.

In order that'my said invention may be properly understood, I have hereunto appended two explanatory sheets of drawings, whereon Figure 1 is a vertical cross-section of the pump. Fig. 2 is a view of the fly-wheel to a reduced scale, and Fig. 3 is a longitudinal section of the foundation. Fig. 4 is a longitudinal section, and Fig. 5 a plan,'of the automatic valve for drawing off excess oil from the pump-barrel.

Referring to the drawings, in carrying out my invention I use, as usual, a cylinder or barrel a, in which works the pump-bucket b. This barrel is fitted on a hollow foundation 0, having a suction passage-way or duct (1 open. at one end d, where it communicates with the tank, vessel, or such like in which it is desired to create a vacuum or from which it is desired to exhaust a part or the whole of the contained air or fluid, and closed at the other end, Where it communicates with the barrel of the pump, by an automaticallyacting valve 6. This valve e consists of a guided spindle fiprovided with two metal disks 9 h at its upper end, between which a leather or rubber washer, ring, or disk i is secured in such manner as to serve as the valve-face. The disk 9 can, as shown, be made in one with the spindle f, while the disk or washer h is held in place by the screw-nut A metal ring is, with an upwardly-projecting ledge or ridge is on it, which serves as the valve-seat,is secured in the foundation. This ring is made to support, by means of arms 10 the guide Z for the valve-spindle.

The top 0 of the foundation 0, which also serves as the bottom of the barrel of the pump, is slightly convexed, so as to cause any excess of oil or the like to run down toward the edge or circumferential rim of the bottom of the barrel, where it collects in a groove 0 and can be drawn off by means of an auto-- matically-acting valve arrangement, hereinafter described.

The bucket is formed into two parts an n, bolted or screwed together, the upper part forming a ring with a central upwardly-projecting cylinder m on it and the lower part forming a ring or disk which serves as the bottom or face plate of the bucket. These parts, which fit and work in the cylinder or barrel of the pump, have secured between them a ring 0, of leather or rubber, which is so bent or shaped as to work tightly against the interior walls of the barrel in the same manner as an ordinary cup-leather. The lower plate n carries in its central aperture a ringseat n,having a raised edge or projection on it.

Fitted in a guide 19 in a bridge q, extending across the cylindrical portion m of the bucket b, is a spindle '2", having a slightlylarger valve .9 of the same construction as the automatic valve 6, hereinbefore referred to. The rubber or leather face sf of this valve works against the aforesaid ring-seat n',fitted in the plate n.

t are screw-nuts for securing the guide 19.

u is the fork, and u, the pivot-pins, of the plunger,secured in place by the taper-pins a 1) is the driving-crank, and e the connecting or pump rod.

c are the standards, fittedin sockets in the foundation. 1

w is a stop-ring for limiting the movement of-the spindle f.

The arrangement is such that at the upstroke of the plunger the upper bucket-valve s by its own weight, combined with the suction at its under side, is held close against its seat,while the lower valve e is raised off its seat. At the downstroke, on the contrary, the upper valve 8 lifts off its seat,while the lower valve closes.

In order to lessen noise and cushion the action of the valves, suitable cushions 0c, of rubber or such like, may be provided on either the guides or the valves.

In some cases, if desired, a spiral or'helical spring can be used to press the upper valve to its seat.

The automatic-valve arrangement shown at Figs. 4c and 5 for drawing off excess of oil from the pump-barrel consists of a coredout metal piece z,which maybe provided with a cut-off plug-tap z and delivery-nozzlez at one end. In the center of the metal piece is an automatically-actin g lift-valve .2 so arranged and fitted, as shown, that at the downstroke of the plunger or bucket it opens upward off its seat ,2 and allows oil to escape, while at the upstroke it closes down on its seat and prevents ingress of air. .2 is an internal guide-plug.

In order to balance the working parts and to utilize the action of the vacuum at the under side of the bucket or plunger of the pump when it is on its downstroke, I prefer to fit on the crank-shaft a flywheel y,which at the side nearly opposite to the crank is weighted or is provided with a weight, as at y.

I'Iavingnow fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In combination in an air-pump, a foundation havinga depressed cavity or duct,with a bracket depending therein, a valve guided in said bracket, the barrel mounted on the foundation, the bucket having a cylindrical portion with a flange m extending laterally around its lower part, the ring n secured to the flange and holding interposed packing, the ring or also held by the said ring at and the bucket and projecting inwardly therefrom, the valve guided within the bucket and resting on the inwardly-projecting ring 01' and means for operating the bucket, substantially as described.

2. In combination, the foundation with its valve, the bucket of cylindrical form having a flange projecting laterally about its lower portion, the valve within the bucket and the ring fitting against the lower part of the bucket, and the removable packing and valveseat ring, one projecting outwardly and the other projecting inwardly from the bucket, both of said parts being held by the said ring at, substantially as described.

3. In combination,the barrel,the foundation with its valve, the bucket having the reduced cylindrical extension with the ring about the lower edge thereof projecting annularly about the cylindrical extension and having an inwardly-projecting valve-seat rim, said cylindrical extension also having a cross-bar and laterally and outwardly extending pivot-pins, the valve seated on the inwardly-projecting rim and having an upwardly-extending stem guided in the cross-bar and the driving-yoke engaging the pivot-pins on the outside of the reduced extension,substantially as described.

Signed at Glasgow, Scotland, this 17th day of January, A. D. 1896.

ALEXANDER SIIIELS.

Vitn eases:

II. D. FITZPATRICK, WILLIAM FLEMING. 

